Air-brake mechanism.



No- 850,564. PATENTED APB. 16,1907.

J. J. 0011. AIR BRAKE MECHANISM.

APPLICATION FILED NOV. 15, 1906.

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-UNITED STATES PATENT orrron JOHN J. COIT, OF VENICE, CALIFORNIA.

AIR-BRAKE MECHANISM.

anism provided with the ordinary braking mechanism and in addition thereto a supplementary or emergency braking mechanism in which the brakes will engage the track and will only be thrown into engagement there- -with after the maximum braking power of the ordinary brake has been used; and the object of my invention is to provide a supplemental or emergency brake of great power which may be thrown into use when more braking force is required than is provided by ordinary air-braking mechanism. I accomplish this object by the mechanism described herein and illustrated in the accompanying drawings, in which Figure 1 is a longitudinal central section of the triple valve by means of which the different brakes are operated. Figs. 2 and 3 are sections on the lines 2 and 3, respectively, of Fig. 1. Fig. 4 is an end elevation. Fig. 5 is a side elevation of a car equipped with my improved braking device.

Referring to the drawin s, (see Fig. 5,) is the body of a street-rai way car to which is secured the compressed-air reservoir 11, which is supplied with compressed air in the usual manner. Leading from the compressed-air reservoir is a-pipe 12, which is connected to a threeway or motormans controller-valve 13, which valve is operated by a lever 14. A pipe connects the controllervalve to my improved triple valve 16, which is also connected by pipe 17 to the compressed-air reservoir. A pipe 18 connects my improved triple valve with the wheel-- brake piston-chamber 19, having a iston therein which operates the wheel-bra es 20 in the usual manner. My improved triple valve is also connectedby pipe 21 with the track-brake piston-chamber 22, having a iston therein which operates the tracklirakes 23, as hereafter explained. In the casing 25 of the triple valve is a piston-chamber 26, which has an enlarged front .end in which is mounted piston 27, having a stem 28, to which is secured piston 29, which has a working fit in the smaller part of chamber 26. A stem is secured to piston 29, and

I Specification of Letters Patent.

Application filed November 15. 1906. Serial No. 343,560.

I l 1 l .catented April 16, 1907.

on said stem 30 is mounted a slide-valve 31,

which is held in place by a nut 32. In the bottom of this slide-valve are cup-shaped recesses 33 and 34. Recess 33 connects channel 35 through ort 35 with exhaustport 36 when the bra es are in their released position. Pipe 21 opens into channel 35, thereby throwing the track-brake piston- -chamber to exhaust when the brakes are in their released position. Recess 34 connects ports 36 and 37-, as shown in Fig. 1, when the brakes are in their released position. Port 36 is connected to or opens into the channel 38, and pipe 15 is also connected to and opens into said channel 38. Channel 38 is connectedby channel 39 with the enlarged or front end of chamber 26 in front of iston 27, so that when airis admitted throug pipe 15 it will exert pressureon the front end of the piston 27, and at the same time the air spring 42, the rear end of which rests against a follower 43, which is held in place by nut 44, by means of which the tension of spring 42 is regulated. The tension of spring 42 is set. at whatever pressure is desired for a service application. A dust-ca 45, which operates as a locknut,'is place on the end 0 this nut. Follower 41 has ports 46 therein. Pipe 17 is connected toand opens into a channel 47, which last channel is connected to a channel 48, which opens into chamber 26 at the rear of piston 29, whereby piston-chamber 26 at the rear of piston 29 is provided with compressed air from the compressed-air reservoir.

In the operation of my device when it is desired to set the brakes on the cars the motorman turns the controller-valve, so as to admit air from reservoir 11, through ipes 12 and 15, into the wheel-brake piston-cliamber and at the same time into the front end of chamber 26. As much air is admitted as A follower 41 is mounted E maybe required to give the wheel-brakes sion of spring42, and thus causes the pistons power of spring 42.

to move toward the rear of the chamber, thereby carrying the slide-valve to cut off the communication between the exhaustport 36 and ort 35" and uncovering said port, so that t e air-pressure from the reservoir will now how direct through pipe 21 to the track-brake piston-chamber, thereby setting the track-brake. The movement of the slide-valve also disconnects ports 36 and 37 and connects port 37 with port 49. This last port opens into a channel50, which leads to and opens into a chamber 51, in which is check-valve 52, Whichcontrols the communication into the chamber. Spring 53 bears a ainst a follower 54, against whichthe stem of the check-valve rests. The other end of the spring rests against the follower 55, and the nut 56 is provided to regulate the tension of spring 53. A dust-cap 57, which is also a lock-nut, incloses the end of the nut. When the slide-valve has connected ports 37 and 49, any excess of air-pressurein the wheelbrake cylinder over the power of spring 53 escapes therefrom by unseating the'checkvalve and passing out through port 58. In the casing between pistons 27 and 29 is an exhaust-pol 59, which keeps that portion of the chamber to exhaust, thereby enabling the pressure on piston 27 in emergency to overcome the pressure on piston 29 and the When the car has been stopped, the controller-valve is turned to throw pipe 15 to exhaust, thereby releasing the pressure on piston 27, when the pressure on piston 29 and the power of spring 42 will return the slide-valve to its normal position,

and the brakes will all release. If it is desired to retain the wheel-brake pressure, the pressure on piston 27 is reduced to only the pressure required to permit the return of the iston to its normal position when the trackiirake will release; but the wheel-brake still holds. The further exhaust will then release the wheel-brakes in the usual manner.

Having described my invention, what I claim is 1. The combination of a reservoir charged with fluid under pressure; a controller-valve fluid-pressure-operated wheel-brake mechanism; fluid pressure operated track brake mechanism; a triple-valve device having a plurality of ports and passages in the casing thereof; connections from said reservoir to said controller-valve and to said triple-valve device; connections from said triple-valve device to said controller-valve and to said wheel-brake mechanism, whereby fluid-pressure from the reservoir will pass through the controller-valve and through the triple-valve device to operate said wheel-brake mechanism; a second connection from said reservoir to said triple-valve device and a connection from said triple-valve device to said trackbrake mechanism; and mechanism in said triple-valve device to out off the fluid-pressure therethrough to the wheel-brake mechanism and to permit the flow of fluid-pressure to the track-brake mechanism when the pressure in the triple-valve device reaches a predetermined point.

2. The combination of a reservoir charged with fluid under pressure; a controller-valve; fluid-pressure-operated Wheel-brake mechanism fluid pressure operated track brake mechanism; a triple-valve device havin a plurality of ports and passages in the casing thereof and mechanism therein, whereby the initial pressure will fiow through the triple valve to the wheel-brake mechanism and when a predetermined pressure has been reached in the tri le valve the flow of fluidpressure to the w eel-brake mechanism will through the valve to the track-brake mechanism; and connections between said parts.

. 3. In an air-brake mechanism, the combination of a reservoir charged with fluid under pressure ;fiuid-pressure-operated wheel-brake mechanism; fluid-pressure-operated trackbrake mechanism; means for connecting said I reservoir with said wheel-brake mechanism, whereby the initial pressure will operate the same; andmeans for connecting said reservoir with said track-brake mechanism and for cutting off the connection to said wheelbrake mechanism when there is an emergency application of brakes to be made.

4. The combination of a reservoir charged with fluid under pressure; a controller-valve;

fluid-pressure-operated wheel-brake mechanism; fluid-pressureroperated track-brake mechanism; a triple-valve device having means therein to permit the initial pressure from said reservoir to pass to and operate said wheel-brake mechanism and when the pressure therein reaches a predetermined point to cut off the pressure to the wheelbrake mechanism and establish communication between said reservoir and said trackbrake mechanism.

5. In an air-brake mechanism, a triplevalve device having a plurality of ports and passages therein and having a chamber there- 1n with the front end thereof of larger diameter than the other portion, said larger portion having an exhaust-port at the rear thereof;

istons in said chamber, one in' the larger ront end and the other in the reduced portion of the chamber, said piston being connected; a slide-valve having a plurality of recesses therein in the smaller end of said chamber at the rear of the pistons and opera: tively connected'thereto and a spring operating to resist the movement of the pistons toward the rear end of the chamber.

6. In an air-brake mechanism, a triplevalve device having a plurality of orts and passages therein and having a charm er therein with the front end thereof of larger diamebe cut off andthe fluid-pressure will then flow.

ter than the other ortion; pistons in said I in the casing Whichis connected to the wheelchamber, one in the arger front end and the brake mechanism. other in the reduced portion of thechamber; In witness that I claim the foregoing I a stem connected to said piston; a stem carhave hereunto subscribed my name this 7th 5 rield bg the smalller lof said pistons a slideday of November, 1906.

Va ve avin a ura it o recesses t erein; a spring in the snihller en d of the chamber; and JOHN 001T a relief-valve connected to the smaller end of Witnesses:

\ the chamber in the triple-valve and adapted G. E. HARPHAM,

10 to be thrown into communication with a port EDMUND A. STRAUSE. 

